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Smart Structures and Systems
  Volume 28, Number 4, October 2021 , pages 579-592

Steel dual-ring dampers: Micro-finite element modelling and validation of cyclic behavior
Mahdi Usefvand, Ali Mohammad Rousta, Mojtaba Gorji Azandariani and Hamid Abdolmaleki

    Extensive studies have been performed by researchers to increase the ductility and energy-absorption of concentrically braced frames. One of the most widely used strategies for increasing ductility and energy-absorbing is the utilization of energy-dissipation systems. In this regard, the energy-dissipation system consisting of a steel dual-ring damper (SDRD) with different construction details is presented, to improve hysteresis behavior and performance of steel ring dampers (SRD). The most important cause of energy-dissipation in SRDs are the development of bending plastic hinges in the rings. Therefore, by adding an inner ring to the SDR system, it increases the number of moment plastic hinges and in turn increases energy dissipation. Parametric studies havse been performed applying the nonlinear micro-finite element (MFE) procedure to investigate the improved models. The parametric studies comprise examining the efficacy of thickness parameters and the inner ring diameters of the improved models. The SRD models was selected as the base model for comparing and evaluating the effects of improved dampers. MFE models were then analyzed under cyclic loading and nonlinear static methods. Confirmation of the results of the MFE models were performed against the test results. The results indicated that the diameter to the thickness ratio of inner ring of SDRDs has a considerable influence on determining the hysteresis behavior, ductility, ultimate capacity and performance, as well as energy dissipation. Also, the results show that the details of the construction of the internal and external ring connections were a considerable effect on the performance and hysteresis behavior of SDRDs.
Key Words
    dual-ring damper (DRD); energy dissipation; micro-finite element (MFE) modeling; performance; yield force
(1) Mahdi Usefvand:
Department of Civil Engineering, Maragheh Branch, Islamic Azad University, Maragheh, Iran;
(2) Ali Mohammad Rousta:
Department of Civil Engineering, Yasouj University, Yasouj, Iran;
(3) Mojtaba Gorji Azandariani:
Centre for Infrastructure Engineering, Western Sydney University, Penrith, Australia;
(4) Mojtaba Gorji Azandariani:
Structural Engineering Division, Faculty of Civil Engineering, Semnan University, Semnan, Iran;
(5) Hamid Abdolmaleki:
Department of Civil Engineering, Tuyserkan Branch, Islamic Azad University, Tuyserkan, Iran.

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